Find the inverse of.

Inverse of A=

Find the inverse of by adjoining the identity matrix:

Use row operations to obtain:

Switch E_{3} withE_{1}

E_{3}=E_{3}-3E_{1}

E_{3}=E_{3}/8

E_{2}=E_{2}/2

E_{2}=E_{2}+1/2E_{3}

E_{1}=E_{1}+3E_{3}

=

Check:

AA^{-1}=